Non-erasable magnetic identification media

a magnetic identification and non-erasable technology, applied in the field of magnetic storage media, to achieve the effect of adding a level of security, eliminating accidental erasure of stored data, and high security

Inactive Publication Date: 2008-05-01
EDELSTEIN ALAN S +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016] Moreover, the invention is capable of being utilized in several different applications. For example, the invention may be used in military dog tags for use in extreme environments, non-magnetic field erasable identification cards, credit cards, debit cards, mass transportation fare card information stripes, highly sensitive and secured identification cards, and magnetic storage disks in computers. All of these uses are advantageous because they are immune to the effects

Problems solved by technology

Furthermore, the areas that are not exposed to the laser

Method used

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first embodiment

[0037] the invention made using standard lithography is illustrated in FIGS. 1 through 5. This embodiment is for a read only media. In this embodiment direct write patterning is performed in areas that are to be covered with a highly permeable material. The direct write patterning can be performed several ways. As illustrated in FIG. 1, the process of manufacturing a magnetic storage media device begins with a substrate 10. The substrate 10 may comprise silicon, glass, quartz, or other materials known in the art that will not modify the magnetic media properties. A first manner of directly writing high and low magnetic permeable materials on the substrate 10 is to use a photoresist 15, wherein the substrate 10 is spin coated with the photoresist 15, as shown in FIG. 2. Then, a laser beam, or other light source, is used to define patterns 18 in the photoresist 15, as illustrated in FIG. 3. The exposure of the photoresist to light makes it soluble. Next, as shown in FIG. 4, a highly p...

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Abstract

A magnetic storage medium and method of manufacturing the same comprises a substrate, a magnetic material adjacent to the substrate, and regions of variable magnetic permeability in the magnetic material, wherein the magnetic material may comprise a multilayered structure. Moreover, methods are described for making two kinds of media, read only and read/write media. Additionally, the magnetic material comprises any of permalloy, metallic glass, copper, nickel, iron, cobalt, boron, silicon and any combination thereof, and the magnetic material is approximately 10 to 1,000 nm thick. The regions of variable magnetic permeability comprise regions having a lower permeability than other regions, wherein the regions having a lower permeability than other regions is crystalline, and the regions having a higher permeability can be either crystalline or amorphous, and wherein the areas of lower and higher permeability are dimensioned and configured to be approximately 1 to 20 microns in size.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This is a continuation-in-part application of pending application Ser. No. 10 / 824,396 filed Apr. 15, 2004.STATEMENT OF GOVERNMENT INTEREST [0002] The invention described herein may be manufactured, used, and / or licensed by or for the United States Government. BACKGROUND OF THE INVENTION [0003] The present invention generally relates to magnetic storage media, and more particularly to read / rewrite magnetic storage media capable of withstanding deleterious effects due to exposure from a magnetic field. DESCRIPTION OF THE RELATED ART [0004] Currently, magnetic information stored on a credit card stripe, debit card stripe, magnetic tape, or hard drive media is stored by maintaining the direction of magnetization in localized areas. Unfortunately, this information is susceptible to being altered or even completely erased if the storage media (credit card stripe, debit card stripe, etc.) is exposed to a magnetic field that is large enough to ...

Claims

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Application Information

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IPC IPC(8): G11B5/66G11B5/33B05D5/12F27B9/12
CPCB82Y10/00G11B5/00808G11B5/855G11B5/82G11B5/743
Inventor EDELSTEIN, ALAN S.FISCHER, GREG A.
Owner EDELSTEIN ALAN S
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